/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.iotdb.db.mpp.plan.planner.plan.node.load;

import org.apache.iotdb.common.rpc.thrift.TRegionReplicaSet;
import org.apache.iotdb.commons.exception.IllegalPathException;
import org.apache.iotdb.db.engine.load.TsFileData;
import org.apache.iotdb.db.mpp.plan.analyze.Analysis;
import org.apache.iotdb.db.mpp.plan.planner.plan.node.PlanNode;
import org.apache.iotdb.db.mpp.plan.planner.plan.node.PlanNodeId;
import org.apache.iotdb.db.mpp.plan.planner.plan.node.PlanNodeType;
import org.apache.iotdb.db.mpp.plan.planner.plan.node.WritePlanNode;
import org.apache.iotdb.tsfile.exception.NotImplementedException;
import org.apache.iotdb.tsfile.exception.write.PageException;
import org.apache.iotdb.tsfile.utils.ReadWriteIOUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.*;
import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.List;

public class LoadTsFilePieceNode extends WritePlanNode {
    private static final Logger logger = LoggerFactory.getLogger(LoadTsFilePieceNode.class);

    private File tsFile;

    private long dataSize;
    private List<TsFileData> tsFileDataList;

    public LoadTsFilePieceNode(PlanNodeId id) {
        super(id);
    }

    public LoadTsFilePieceNode(PlanNodeId id, File tsFile) {
        super(id);
        this.tsFile = tsFile;
        this.dataSize = 0;
        this.tsFileDataList = new ArrayList<>();
    }

    public long getDataSize() {
        return dataSize;
    }

    public void addTsFileData(TsFileData tsFileData) {
        tsFileDataList.add(tsFileData);
        dataSize += tsFileData.getDataSize();
    }

    public List<TsFileData> getAllTsFileData() {
        return tsFileDataList;
    }

    public File getTsFile() {
        return tsFile;
    }

    @Override
    public TRegionReplicaSet getRegionReplicaSet() {
        return null;
    }

    @Override
    public List<PlanNode> getChildren() {
        return null;
    }

    @Override
    public void addChild(PlanNode child) {
    }

    @Override
    public PlanNode clone() {
        throw new NotImplementedException("clone of load piece TsFile is not implemented");
    }

    @Override
    public int allowedChildCount() {
        return NO_CHILD_ALLOWED;
    }

    @Override
    public List<String> getOutputColumnNames() {
        return null;
    }

    @Override
    protected void serializeAttributes(ByteBuffer byteBuffer) {
        try {
            ByteArrayOutputStream byteOutputStream = new ByteArrayOutputStream();
            DataOutputStream stream = new DataOutputStream(byteOutputStream);
            serializeAttributes(stream);
            byteBuffer.put(byteOutputStream.toByteArray());
        } catch (IOException e) {
            logger.error("Serialize to ByteBuffer error.", e);
        }
    }

    @Override
    protected void serializeAttributes(DataOutputStream stream) throws IOException {
        PlanNodeType.LOAD_TSFILE.serialize(stream);
        ReadWriteIOUtils.write(tsFile.getPath(), stream); // TODO: can save this space
        ReadWriteIOUtils.write(tsFileDataList.size(), stream);
        for (TsFileData tsFileData : tsFileDataList) {
            try {
                tsFileData.serialize(stream);
            } catch (IOException e) {
                logger.error(
                        String.format(
                                "Serialize data of TsFile %s error, skip TsFileData %s",
                                tsFile.getPath(), tsFileData));
            }
        }
    }

    @Override
    public List<WritePlanNode> splitByPartition(Analysis analysis) {
        throw new NotImplementedException("split load piece TsFile is not implemented");
    }

    public static PlanNode deserialize(ByteBuffer buffer) {
        InputStream stream = new ByteArrayInputStream(buffer.array());
        try {
            ReadWriteIOUtils.readShort(stream); // read PlanNodeType
            File tsFile = new File(ReadWriteIOUtils.readString(stream));
            LoadTsFilePieceNode pieceNode = new LoadTsFilePieceNode(new PlanNodeId(""), tsFile);
            int tsFileDataSize = ReadWriteIOUtils.readInt(stream);
            for (int i = 0; i < tsFileDataSize; i++) {
                TsFileData tsFileData = TsFileData.deserialize(stream);
                pieceNode.addTsFileData(tsFileData);
            }
            pieceNode.setPlanNodeId(PlanNodeId.deserialize(stream));
            return pieceNode;
        } catch (IOException | PageException | IllegalPathException e) {
            logger.error(String.format("Deserialize %s error.", LoadTsFilePieceNode.class.getName()), e);
            return null;
        }
    }

    @Override
    public String toString() {
        return "LoadTsFilePieceNode{" + "tsFile=" + tsFile + ", dataSize=" + dataSize + '}';
    }
}
